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- Nanoclay (3)
- Nanoparticle incorporated Polypropylene Spunbond Webs (2)
- Nanoparticle incorporated Spunbond webs (2)
- Additives; nanotechnology; nanocomposites; spunbond web (1)
- Composites (1)
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- Depth profile of PCBM in P3HT (1)
- Fibers (1)
- Injection molded nanoclay-composites (1)
- Miscibility (1)
- Morphology; Organic solar cell; Solvent annealing; Crystallinity; Depth profile (1)
- Nanoclay Reinforced Fibers and Nonwovens (1)
- Nanocomposite (1)
- Neutron reflectivity (1)
- Nonwoven nanocomposite (1)
- Nylon 6 Blown Films (1)
- PCBM (1)
- Polypropylene (1)
- Polypropylene; nanocomposites; additive; crystallization mechanisms; morphology; spherulite; structure–property relations (1)
- Structure and properties of polypropylene-nanoclay composites (1)
- Structure-property relations (1)
- The impact of controlled solvent exposure on the morphology, structure and function of bulk heterojunction solar cells (1)
- The miscibility and depth profile of PCBM in P3HT: thermodynamic information to improve organic photovoltaics (1)
- The morphology of nanoclay nanocomposites (1)
Articles 1 - 7 of 7
Full-Text Articles in Materials Science and Engineering
Structure And Properties Of Polypropylene-Nanoclay Composites, Raghavendra R. Hegde Dr
Structure And Properties Of Polypropylene-Nanoclay Composites, Raghavendra R. Hegde Dr
Raghavendra R Hegde Dr
The structure, morphology and mechanical properties of polypropylene-nanoclay composites with 1 to 15 wt.% nanoclay additives were investigated. Mixture of intercalated and exfoliated morphology was observed in nanocomposites. At higher weight percentage reinforcement (10–15 wt.%), up to 67 % improvement in tensile modulus is observed. At higher weight percentage, exclusion of clay additives at the boundary of spherulites was observed. This study illustrates that along with the thermodynamic driving force, spherulite formation also drives the ultimate morphology
Investigation Of The Morphology Of Polypropylene-Nanoclay Nanocomposites, Raghavendra R. Hegde Dr
Investigation Of The Morphology Of Polypropylene-Nanoclay Nanocomposites, Raghavendra R. Hegde Dr
Raghavendra R Hegde Dr
The morphology development in polypropylene − nanoclay composites with different weight percentages of nanoclay additives was studied using a combination of wide-angle X-ray diffraction, small-angle X-ray scattering (SAXS), polarized optical microscopy and transmission electron microscopy. SAXS studies showed an increase in long period with increase in additive weight percentage. Thermal analysis showed that even if the clay platelets are not completely exfoliated they can act as effective nucleating agents. Studies indicated that the ultimate morphology formation is influenced by both the thermodynamics of mixing and crystallization and spherulite formation. During spherulite growth, unenclosed clay platelets were excluded at the spherulite …
The Impact Of Controlled Solvent Exposure On The Morphology, Structure And Function Of Bulk Heterojunction Solar Cells, Raghavendra R. Hegde Dr
The Impact Of Controlled Solvent Exposure On The Morphology, Structure And Function Of Bulk Heterojunction Solar Cells, Raghavendra R. Hegde Dr
Raghavendra R Hegde Dr
Films of poly(3-hexyl thiophene) (P3HT):[6,6]-phenyl C61-butyric acid methyl ester (PCBM) were controllably exposed to CS2 vapor in a column with a linear solvent vapor pressure gradient. Changes in the morphology of the P3HT:PCBM thin film were monitored and correlated to the ability of this thin film to act as the active layer in an organic solar cell. The results show that the crystallinity and crystal size of the P3HT increase initially with solvent vapor pressure and annealing time, but longer exposure to solvent decreases P3HT crystallinity and photovoltaic efficiency. Neutron reflectivity indicates that the PCBM segregates to the Si substrate …
The Miscibility And Depth Profile Of Pcbm In P3ht: Thermodynamic Information To Improve Organic Photovoltaics, Raghavendra R. Hegde Dr
The Miscibility And Depth Profile Of Pcbm In P3ht: Thermodynamic Information To Improve Organic Photovoltaics, Raghavendra R. Hegde Dr
Raghavendra R Hegde Dr
Recent work has shown that poly(3-hexylthiophene) (P3HT) and the surface-functionalized fullerene 1-(3-methyloxycarbonyl)propyl(1-phenyl[6,6])C(61) (PCBM) are much more miscible than originally thought, and the evidence of this miscibility requires a return to understanding the optimal morphology and structure of organic photovoltaic active layers. This manuscript describes the results of experiments that were designed to provide quantitative thermodynamic information on the miscibility, interdiffusion, and depth profile of P3HT : PCBM thin films that are formed by thermally annealing initial bilayers. It is found that the resultant thin films consist of a 'bulk' layer that is not influenced by the air or substrate surface. …
Morphology And Properties Of Nylon 6 Blown Films Reinforced With Different Weight Percentage Of Nanoclay Additives, Raghavendra R. Hegde Dr
Morphology And Properties Of Nylon 6 Blown Films Reinforced With Different Weight Percentage Of Nanoclay Additives, Raghavendra R. Hegde Dr
Raghavendra R Hegde Dr
This article presents the effect of increasing weight percentage natural nanoclay additives on the structure, morphology and mechanical properties of nylon-6-blown films. Combination of X-ray diffraction, thermal analysis and microscopy were used to determine nanocomposite film morphology. The nanoclay additives in the films act as nucleating agent facilitates γ-crystalline forms and results in fine grained spherulite with smaller lamellar size. Increase in tensile, burst, and tear strength is observed for films with up to 5% clay loading. Even though microscale property like tensile and tear strength drops at higher add on levels, near-surface nanoscale hardness and toughness of the film …
Nanoparticle Effects On The Morphology And Mechanicalproperties Of Polypropylene Spunbond Webs, Raghavendra Hegde, Gajanan S. Bhat
Nanoparticle Effects On The Morphology And Mechanicalproperties Of Polypropylene Spunbond Webs, Raghavendra Hegde, Gajanan S. Bhat
Raghavendra R Hegde Dr
We report morphology and mechanical properties of natural nanoclay incorporated spunbond polypropylene composite webs. Nanocomposite spunbond webs were produced with up to 5 wt % natural nanoclay additives on ReicofilVR -2 spunbond line. Influence of nanoclay on the resin rheological properties, processibility, and mechanical properties of webs were studied. Wide angle X-ray diffraction and transmission electron microscopy analysis were used to investigate the nanocomposite morphology. Intercalated and flocculated morphology was observed for all the concentrates and for all the spunbond fiber webs. The microstructure and polymer morphology in the presence of additives was characterized using a polarized optical microscope. At …
Nanoclay Reinforced Fibers And Nonwovens, Raghavendra R. Hegde Dr
Nanoclay Reinforced Fibers And Nonwovens, Raghavendra R. Hegde Dr
Raghavendra R Hegde Dr
In this research, polypropylene fibers and nonwoven samples were produced with the commercial samples of nanoclay additives in semi-commercial processing machinery. Influence of two different types of nanoclay additives, at different add on levels on processing, structure and morphology of nonwovens is studied. The WAXD and DSC data showed some change in crystallinity and melting behavior indicating changes in the fiber morphology towards improved mechanical properties. Presence and extent of exfoliation of nanoclay in the polymer was verified using transmission electron microscopy (TEM). TEM image reveals intercalated and exfoliated morphology of nanocomposites. About 10 to 20 % increase in tensile …